WO2002007891A1 - Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation - Google Patents

Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation Download PDF

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Publication number
WO2002007891A1
WO2002007891A1 PCT/FI2001/000679 FI0100679W WO0207891A1 WO 2002007891 A1 WO2002007891 A1 WO 2002007891A1 FI 0100679 W FI0100679 W FI 0100679W WO 0207891 A1 WO0207891 A1 WO 0207891A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
chambers
outer edge
cover plate
slurry
Prior art date
Application number
PCT/FI2001/000679
Other languages
English (en)
Inventor
Peter Bourke
Original Assignee
Outokumpu Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BR0112649-0A priority Critical patent/BR0112649A/pt
Priority to PL01365753A priority patent/PL365753A1/xx
Priority to MXPA03000541A priority patent/MXPA03000541A/es
Priority to EA200300176A priority patent/EA004722B1/ru
Priority to AU2001279846A priority patent/AU2001279846B2/en
Priority to AU7984601A priority patent/AU7984601A/xx
Application filed by Outokumpu Oyj filed Critical Outokumpu Oyj
Priority to NZ523636A priority patent/NZ523636A/en
Priority to CA2418196A priority patent/CA2418196C/fr
Priority to EP01958108A priority patent/EP1309408A1/fr
Priority to US10/332,335 priority patent/US6772885B2/en
Publication of WO2002007891A1 publication Critical patent/WO2002007891A1/fr
Priority to NO20030305A priority patent/NO20030305L/no

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern

Definitions

  • the present invention relates to a rotor used in the flotation mechanism in the concentration of ores.
  • upper part of the rotor chambers under the rotor cover are formed to be downward inclined from the outer edge of the chambers into the core so that they form an angle between 5 to 70 degrees with the horizontal plane.
  • the upper surface of the rotor cover can be inclined upwards raising from around the rotor shaft towards the outer edge at an angle between 5 - 70 degrees.
  • the developed rotor improves the suspension of coarse particles with high specific gravity within a flotation machine.
  • the invention relates also to a method for inverting the material flow discharging from the rotor.
  • Flotation is essentially a three phase process involving the mixing of finely ground solids, and air to concentrate valuable minerals from gangue by floating one away from the other.
  • water is added to the ore and fed to a comminution circuit whereby the ore is broken down and reduced in size to form a finely ground solid/liquid mixture called a slurry or pulp.
  • the slurry is then further processed through a group or bank of flotation devices which have flotation mechanisms suitable for keeping the slurry mixture suspended while at the same time air is induced through the mechanism and dispersed evenly throughout the cell.
  • Suitable reagents are also added to the process that are capable of coating the surfaces of the valuable minerals to make their surfaces hydrophobic and so promote bubble/particle attachment. Once the valuable mineral particles attach to an air bubble they slowly rise to the cell surface to form a stable froth zone. This froth containing the valuable minerals is then recovered via a launder system to complete the flotation process.
  • a flotation device can be broken down into the following zones: 1) a mixing zone, 2) a quiescent zone, 3) an enrichment zone and 4) a froth zone.
  • the mixing zone is located in the lower region of the flotation device where there is a significant zone of turbulence created by the high velocity pulp flows exiting the flotation mechanism.
  • the quiescent zone is directly above the mixing zone and is a region where the secondary pulp (slurry) flows are of a much lower velocity and promote the upward movement of valuable mineral particles attached to air bubbles.
  • the enrichment zone is directly under the froth zone and can extend 4 to 6 inches below the froth/pulp interface.
  • the froth zone, quiescent zone and enrichment zone are also important regions within a flotation cell
  • the mixing zone is the most important region within a flotation device for it is in this region that particle suspension and air dispersion takes place. If the flotation mechanism fails to properly disperse the air throughout the cell or if the solids suspension is inadequate then the flotation process suffers and the overall recovery of the desired minerals will be less.
  • a very common type of flotation mechanism consists of a rotating rotor and stator blades around the rotor. Air is fed near the rotor for example through the rotor shaft. As a result of flotation, valuable mineral particles attach to air bubbles and accumulate in a froth in the upper part of the flotation cell and is discharged through a launder of the cell. Tailings of the slurry are directed to the next separation step.
  • the rotor body includes a horizontal top plate and a plurality of vertically oriented rotor blades which form pump chambers. Air is pumped to each chamber for aerating the pulp of the flotation cell.
  • the stator blades are deflected outwardly from their upper part, the lower part being vertical. The discharge of the slurry flow exiting the rotor is predominantly horizontal. However, the stator incorporates a deflector vane which effectively deflects this flow downwards at approximately 15 degrees.
  • the rotor has a horizontal barrier in the middle of the pumping chambers which again deflects both the upward and downward flows entering the rotor in a predominantly horizontal direction when discharged.
  • a flotation machine which has a plurality of vertical oriented plates which form the pumping chambers. Air is pumped to each chamber via a vertical downcomer which also incorporates and supports a horizontal shroud directly above the rotor. This shroud also supports the vertical stator blades. While the slurry flow entering the rotor is initially deflected upwards as it exits the rotor pumping slots it is deflected horizontally by the overhung shroud and is pumped radially outwards through the stator blades.
  • a new type rotor of a flotation mechanism is now developed especially for a material which is coarse and has a high specific gravity. It has been proved that a vertical section downward tapered rotor which is equipped with means to direct the slurry flow upwards instead of horizontal direction allows the rotor to vary the mixing flow patterns within the machine and without interfering with the upper enrichment and froth zones within the cell.
  • the angle of the means with the horizontal plane is between 5 and 70 degrees, preferably between 5 and 40 degrees. It is preferable that there are also means in two levels and then it is advisable they have essentially same angle.
  • the invention relates also to a method to incline slurry flow essentially at the same angle as that of the means itself.
  • the flotation machine is formed of a stator having mainly vertical stator blades and a rotor which is in vertical section downward tapered and the vertical rotor blades form chambers (slots). Air is conducted to the machine through the rotor shaft and directed through the chambers into the slurry.
  • the chambers can be common both for slurry and air or there can be separate chambers for air and slurry.
  • the rotor blades are covered with a cover plate which reaches to the outer edge of the blades. The upper part of the chambers under the cover are now formed to be downward inclined from their outer edge into the core so that they form an angle between 5 and 70 degrees with the horizontal plane.
  • the slurry flow is inclined upwards in the chambers instead of normal horizontal direction and so the slurry flow discharging the rotor directs according to the angle of the upper part of the chamber.
  • the rotor is equipped with means for turning the slurry flow above the rotor and then the upper surface of the rotor cover is formulated so that its outer edge is raised with proportion to the inner edge around the shaft. It is cleat that the means can be constructed so that their surface towards the slurry is either straight or curved, concave or convex.
  • the cover of the rotor can be formed so that its outer edge reaches to the outer edge of the rotor blades but the rotor cover itself is inclined upwards.
  • a conventional rotor can be modified to the rotor according to the invention simply by equipping the normal horizontal cover plate of the rotor with additional means which change the upper part of the chambers and the surface part of the rotor cover plate.
  • Modifying of the upper part of the chambers can take place by inserting each chamber a plate located in between the rotor blades that form the chambers.
  • the plates are joined at their outer terminal edge to the horizontal cover plate and extend downwardly at a selected angle to their inner edge until they intersect with the vertical rotor blades in the core of each chamber.
  • Inclining the upper part of the horizontal rotor cover can take place equipping the rotor cover with another plate situated above the rotor cover.
  • the upper plate is directed upwards from the level of the cover plate so that around the shaft this annular outer surface plate is attached to the rotor cover plate and at its outer edge said plate is raised by a vertical plate extending up from the cover plate said plate running coaxially with that of the shaft.
  • the outer surface plate has a sloping surface formed like a cone.
  • a conventional OK-rotor can be equipped with means or plates which limit only pumping chambers and separate air chambers reach to the horizontal cover plate.
  • figure 1 is an oblique axonometric principle diagram of the flotation mechanism of the prior art
  • figure 2 is a vertical section of the flotation mechanism of the invention
  • figure 3 is an oblique axonometric principle diagram of the flotation mechanism of the invention.
  • a flotation mechanism 1 forms of a stator 2 and a rotor 3 inside the stator.
  • the stator has essentially vertical stator blades 4 radially around the rotor.
  • the stator blades are fixed on a base plate 5 which again is supported to the bottom of the flotation machine (not in the figure).
  • the rotor described is a typical OK-rotor in which the rotor suspends from a hollow rotor shaft 6 and pressure air for dispersing into the slurry in the cell is pumped through the shaft.
  • the rotor itself is formed of a horizontal cover plate 7 and rotor blades 8 attached to the cover.
  • the vertical section of the rotor is a downward tapered cone.
  • the blades 8 are essentially vertical and they are arranged so that there form air chambers 9 through which the air is pumped to the slurry. Pumping chambers 10 for slurry are in between each air slots.
  • the cover plate is attached from its inner edge around the shaft. The direction of the slurry discharged from the rotor is mainly horizontal.
  • FIG. 2 describes a flotation mechanism according to the invention.
  • the flotation mechanism 1 is formed of a stator 2 with vertical stator blades 4 and a base plate 5 and of a rotor 11.
  • the vertical section of the rotor 11 is a downward tapered rotor with chambers but a horizontal cover plate 12 above the rotor blades is equipped with aligning means 13 and 14.
  • the aligning means 13 achieve an inclination downwards at an angle of between 5 - 70 degrees below the cover in the chambers 15 and an aligning means 14 upwards above the cover.
  • the chambers 15 of the rotor are formulated so that at the outer and upper edge 16 the chambers reach to the horizontal cover plate 12 but towards the core 17 of the chamber the height of the chambers decreases depending on the angle of the means 13.
  • the upper surface of the rotor cover is inclined upwards so that it raises from around the shaft 6 towards the outer edge 18 at an angle of between 5 - 70°.
  • the outer edge of the rotor cover with its means is essentially vertical. The figure is explained in a way how an existing rotor cover is modified but it is clear that the cover plate can be constructed to its form in manufacturing stage.
  • the additional means inclined as described above collectively result in both the primary F1 and the secondary F2 flow being deflected upwards and they give a nett resultant upward flow pattern rather than the previous existing horizontal flow pattern referred in the prior art.
  • FIG. 3 shows an example to modify a conventional OK-rotor according to the invention.
  • the flotation mechanism 1 is formed of a stator 2 with vertical stator blades 4 and a base plate 5 and of a rotor 11.
  • the vertical section of the rotor 11 is a downward tapered OK-type rotor with air slots 19 and pumping chambers 20.
  • the horizontal cover plate 21 above the rotor blades is equipped with an additional upper surface plate 22 which is annular and is attached to the cover plate at its inner edge 23 around the shaft 6.
  • the outer edge 24 of the upper surface plate is joined to the outer edge 25 of the cover plate 21 with the aid of a vertical plate 26 running coaxially with that of the shaft.
  • the outer surface plate is inclined upwards at an angle of between 5 - 70 degrees.
  • Each pumping chamber 20 is equipped with an additional plate 27 which is inclined downwards toward the core 28 of the pumping chamber.
  • the outer perimeter 29 of the slurry directing plate 27 extendsto the upper edge 30 of the chamber 20 and to the outer edge 25 of the cover plate underneath it and the plates are joined together.
  • the slurry directing plate 27 is joined by its sides to the rotor blades which form the pumping chamber and the inner edge 31 of the directing plate reaches to the core of the chamber. It is preferably that the slurry directing plates have the same angle as the outer surface plate. If a rotor has common chambers for air and slurry the plates described above can be installed to each chambers.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne un rotor pour mécanisme de flottation dans la concentration de minerais. Selon l'invention, une partie supérieure des chambres de rotor sous le capot du rotor sont formées de façon à être inclinées vers le bas à partir du bord extérieur des chambres jusqu'à descendre dans l'armature, pour qu'elles forment un angle compris entre 5 et 70 degrés avec le plan horizontal. De plus, la surface supérieure du capot du rotor peut être inclinée vers le haut s'élevant de derrière l'arbre du rotor jusque vers le bord extérieur selon un angle compris entre 5 et 70 degrés. A l'aide de dispositifs situés à l'intérieur et au-dessus du rotor, la pulpe est dirigée vers le haut à travers le stator du mécanisme de flottation. Le rotor développé permet d'améliorer la suspension de grosses particules avec une gravité spécifique élevée à l'intérieur d'une machine de flottation. L'invention concerne également un procédé servant à inverser le flux de matière déchargée du rotor.
PCT/FI2001/000679 2000-07-21 2001-07-19 Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation WO2002007891A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
PL01365753A PL365753A1 (en) 2000-07-21 2001-07-19 Rotor for flotation mechanism and method for directing material flow in flotation machine
MXPA03000541A MXPA03000541A (es) 2000-07-21 2001-07-19 Rotor para mecanismo de flotacion y metodo para dirigir el flujo de material en una maquina de flotacion.
EA200300176A EA004722B1 (ru) 2000-07-21 2001-07-19 Ротор для флотационного механизма и способ направления потока материала во флотационной машине
AU2001279846A AU2001279846B2 (en) 2000-07-21 2001-07-19 Rotor for flotation mechanism and method for directing material flow in flotation machine
AU7984601A AU7984601A (en) 2000-07-21 2001-07-19 Rotor for flotation mechanism and method for directing material flow in flotation machine
BR0112649-0A BR0112649A (pt) 2000-07-21 2001-07-19 Rotor para mecanismo de flotação e método para direcionar fluxo de material em máquina de flotação
NZ523636A NZ523636A (en) 2000-07-21 2001-07-19 Rotor for flotation mechanism and method for directing material flow in flotation machine
CA2418196A CA2418196C (fr) 2000-07-21 2001-07-19 Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation
EP01958108A EP1309408A1 (fr) 2000-07-21 2001-07-19 Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation
US10/332,335 US6772885B2 (en) 2000-07-21 2001-07-19 Rotor for flotation mechanism and method for directing material flow in flotation machine
NO20030305A NO20030305L (no) 2000-07-21 2003-01-20 Rotor for flotasjonsmekanisme og fremgangsmåte for å före strömningsmateriale i flotasjonsmaskin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20001699A FI109180B (fi) 2000-07-21 2000-07-21 Vaahdotusmekanismin roottori ja menetelmä materiaalivirran suuntaamiseksi vaahdotuskoneessa
FI20001699 2000-07-21

Publications (1)

Publication Number Publication Date
WO2002007891A1 true WO2002007891A1 (fr) 2002-01-31

Family

ID=8558809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000679 WO2002007891A1 (fr) 2000-07-21 2001-07-19 Rotor pour mecanisme de flottation et procede servant a diriger le flux de matiere dans la machine de flottation

Country Status (16)

Country Link
US (1) US6772885B2 (fr)
EP (1) EP1309408A1 (fr)
CN (1) CN1315578C (fr)
AR (1) AR030252A1 (fr)
AU (2) AU7984601A (fr)
BR (1) BR0112649A (fr)
CA (1) CA2418196C (fr)
EA (1) EA004722B1 (fr)
FI (1) FI109180B (fr)
MX (1) MXPA03000541A (fr)
NO (1) NO20030305L (fr)
NZ (1) NZ523636A (fr)
PE (1) PE20020248A1 (fr)
PL (1) PL365753A1 (fr)
WO (1) WO2002007891A1 (fr)
ZA (1) ZA200300362B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI119047B (fi) * 2006-11-22 2008-07-15 Outotec Oyj Vaahdotuskoneen roottori, menetelmä roottorin muodostamiseksi ja menetelmä roottorin huoltamiseksi
CN101708488B (zh) * 2009-12-08 2013-04-17 北京矿冶研究总院 浮选机叶轮
CN103464306A (zh) * 2013-09-25 2013-12-25 瓮福（集团）有限责任公司 一种耐磨的浮选机转子装置
CN104307395B (zh) * 2014-09-17 2017-02-22 姚宇乐 一种矿浆分散槽
CN106006813B (zh) * 2016-07-06 2019-02-05 中国水产科学研究院渔业机械仪器研究所 一种箱型转子碎气式气浮装置
DE102018109952B4 (de) 2018-04-25 2021-08-05 Takraf Gmbh Vorrichtung zur Gasblasenerzeugung in Suspensionen zur Anreicherung von mineralischen und nicht mineralischen Rohstoffen und Verwendung einer solchen Vorrichtung
CN109013069A (zh) * 2018-09-25 2018-12-18 北矿机电科技有限责任公司 一种浮选机的叶轮
CN110170382A (zh) * 2019-06-26 2019-08-27 绍兴金冶环保科技有限公司 叶桨式冶金浮选机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892543A (en) * 1956-02-27 1959-06-30 Mining Process & Patent Co Aerator assembly with pulp elevating discharge
US4078026A (en) * 1973-06-05 1978-03-07 Outokumpu Oy Device for dispersing gas into a liquid
SU1273174A1 (ru) * 1985-02-25 1986-11-30 Krylo Evgenij Аэрационный узел флотационной машины
EP0287251A2 (fr) * 1987-04-16 1988-10-19 Dorr-Oliver Incorporated Dispositif de flottation
US5591327A (en) * 1993-12-09 1997-01-07 Walters; Jeremy P. A. Flotation equipment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393976A (en) * 1941-05-31 1946-02-05 Mining Process & Patent Co Agitating means and method
US2767965A (en) * 1950-11-03 1956-10-23 Mining Process & Patent Co Dual pumping agitation
GB832526A (en) * 1956-09-27 1960-04-13 Metalurski Inst Pri Tehniski F Stirrers for flotation cells or agitators
SU904788A1 (ru) * 1980-05-07 1982-02-15 Башкирский Ордена Трудового Красного Знамени Медно-Серный Комбинат Конический импеллер флотационной машины

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892543A (en) * 1956-02-27 1959-06-30 Mining Process & Patent Co Aerator assembly with pulp elevating discharge
US4078026A (en) * 1973-06-05 1978-03-07 Outokumpu Oy Device for dispersing gas into a liquid
SU1273174A1 (ru) * 1985-02-25 1986-11-30 Krylo Evgenij Аэрационный узел флотационной машины
EP0287251A2 (fr) * 1987-04-16 1988-10-19 Dorr-Oliver Incorporated Dispositif de flottation
US5591327A (en) * 1993-12-09 1997-01-07 Walters; Jeremy P. A. Flotation equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8729, Derwent World Patents Index; AN 1987-204342, XP002958673 *

Also Published As

Publication number Publication date
FI20001699A (fi) 2002-01-22
AU7984601A (en) 2002-02-05
EP1309408A1 (fr) 2003-05-14
PE20020248A1 (es) 2002-05-06
MXPA03000541A (es) 2003-05-14
EA004722B1 (ru) 2004-08-26
NZ523636A (en) 2003-10-31
BR0112649A (pt) 2003-06-24
FI109180B (fi) 2002-06-14
NO20030305D0 (no) 2003-01-20
CA2418196A1 (fr) 2002-01-31
CA2418196C (fr) 2010-09-21
ZA200300362B (en) 2003-07-31
CN1638873A (zh) 2005-07-13
US6772885B2 (en) 2004-08-10
FI20001699A0 (fi) 2000-07-21
AR030252A1 (es) 2003-08-13
CN1315578C (zh) 2007-05-16
EA200300176A1 (ru) 2003-08-28
PL365753A1 (en) 2005-01-10
NO20030305L (no) 2003-03-18
US20040112835A1 (en) 2004-06-17
AU2001279846B2 (en) 2006-02-02

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